import json, os, sys, urllib.parse, urllib.request, urllib.error


def _cfg():
    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))


def _inputs():
    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))


def _token(cfg):
    form = urllib.parse.urlencode({
        "grant_type": "client_credentials",
        "client_id": str(cfg.get("client_id", "")),
        "client_secret": str(cfg.get("client_secret", "")),
        "scope": "token",
    }).encode("utf-8")
    req = urllib.request.Request("https://id.sophos.com/api/v2/oauth2/token", data=form,
                                 headers={"Content-Type": "application/x-www-form-urlencoded",
                                          "Accept": "application/json"}, method="POST")
    with urllib.request.urlopen(req, timeout=60) as r:
        tok = json.loads(r.read())
    if not tok.get("access_token"):
        raise Exception("Token request failed: " + json.dumps(tok))
    return tok["access_token"]


def _whoami(token):
    req = urllib.request.Request("https://api.central.sophos.com/whoami/v1",
                                 headers={"Authorization": "Bearer " + token, "Accept": "application/json"}, method="GET")
    with urllib.request.urlopen(req, timeout=60) as r:
        wi = json.loads(r.read())
    tenant = wi.get("id")
    region = (wi.get("apiHosts") or {}).get("dataRegion")
    if not tenant or not region:
        raise Exception("whoami failed: " + json.dumps(wi))
    return tenant, region.rstrip("/")


def _ctx_auth(cfg):
    token = _token(cfg)
    tenant, region = _whoami(token)
    return token, tenant, region


def request(method, path, token, tenant, region, body=None, params=None):
    url = region + path
    if params:
        clean = {k: v for k, v in params.items() if v not in (None, "")}
        if clean:
            url += "?" + urllib.parse.urlencode(clean)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Authorization": "Bearer " + token, "X-Tenant-ID": tenant, "Accept": "application/json"}
    if data is not None:
        headers["Content-Type"] = "application/json"
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    with urllib.request.urlopen(req, timeout=90) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


def _run(fn):
    try:
        cfg = _cfg()
        inputs = _inputs()
        token, tenant, region = _ctx_auth(cfg)
        print(json.dumps(fn(token, tenant, region, inputs)))
    except urllib.error.HTTPError as e:
        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
        sys.exit(1)
    except Exception as e:
        print(json.dumps({"error": str(e)}))
        sys.exit(1)


def main(token, tenant, region, inputs):
    endpoint_id = inputs.get("endpoint_id")
    if not endpoint_id:
        raise Exception("endpoint_id is required")
    q = lambda v: urllib.parse.quote(str(v), safe="")
    return request("POST", "/endpoint/v1/endpoints/" + q(endpoint_id) + "/scans", token, tenant, region, body={})


_run(main)